SHIMANO FC-R8100-P (ULTEGRA) | Dual-Sided Power Meter Crank that Visualizes Power

Get numerical insights into how to get faster that you can't see just by feel.

The SHIMANO ULTEGRA R8100 series "FC-R8100-P" is a dual-sided power meter integrated crankset that supports independent left and right measurement.

Shimano's unique strain gauge technology achieves highly accurate power measurement of ±2% across the entire calibration range. It supports not only left and right power balance but also force vector measurement, which helps in analyzing pedaling efficiency and optimizing training.

The power meter is smartly integrated into the crank, ensuring waterproofing and high durability. The active temperature compensation function makes it less susceptible to environmental changes, enabling stable measurement regardless of season or conditions.

Furthermore, it supports Bluetooth® LE and ANT+, allowing easy connection to cycling computers and training apps. This high-performance power meter crank is widely used by race-oriented riders, long-distance riders, and training enthusiasts alike.

Features

• ULTEGRA R8100 series dual-sided power meter crank
• Supports independent left and right power measurement
• Adopts Shimano's unique strain gauge technology
• High-precision data acquisition with ±2% measurement accuracy
• Supports force vector measurement
• Equipped with active temperature compensation function
• Bluetooth® LE and ANT+ connectivity
• Easy zero offset calibration with a button on the unit
• Integrated design with excellent waterproofing and durability
• Supports data analysis with SHIMANO CONNECT Lab

SPEC

• Series: ULTEGRA R8100
• Model: FC-R8100-P
• Compatible speeds: 2×12speed
• Power measurement: Independent left and right measurement
• Measurement accuracy: ±2%
• Number of strain sensors: 24
• Force vector measurement: Supported
• Cadence measurement: Supported
• Connectivity: Bluetooth® LE / ANT+
• Temperature compensation: Active temperature compensation
• Battery: Built-in lithium-ion
• Battery life: Approximately 226-300 hours
• Chainring configuration: 50-34T / 52-36T / no chainring
• Crank arm length: 160 / 165 / 170 / 172.5 / 175mm
• Average weight: 758g (50-34T), 769g (52-36T)

If you are serious about training, a power meter can be a very powerful tool.

The FC-R8100-P can measure left and right independently, allowing you to understand not only simple power output but also left/right balance and pedaling habits. By utilizing the force vector function, you can objectively analyze your pedaling.

The crank-integrated design gives it a clean look, and it also seems to have excellent waterproofing and durability. It's recommended not only for riders aiming for races but also for long-distance riders who want to get faster efficiently.

As expected from the ULTEGRA grade, I believe it is a power meter crank with an excellent balance of performance and price.